Select option restriction to particular rows

Dear Gurus,

I have searched the form for this but couldn't find the particular solution.

my scenario is i need to enter only 5 plants in the select options it should not exceed  it, for this i have done  like

select options :S_PLANT FOR  G_PLANT NO INTERVALS.

CONSTANTS:   LC_OPT_LIST TYPE RSREST_OPL VALUE 'OPT_LIST',

                LC_S        TYPE RSSCR_KIND VALUE 'S',

                LC_MAT      TYPE BLOCKNAME  VALUE 'S_PLANT',

                LC_INC      TYPE C          VALUE 'I'.

   DATA:  LW_OPT_LIST TYPE SSCR_OPT_LIST,

          LW_RESTRICT TYPE SSCR_RESTRICT,

          LW_***      TYPE SSCR_***.

   LW_OPT_LIST-NAME       = LC_OPT_LIST.

   LW_OPT_LIST-OPTIONS-BT = SPACE.

   LW_OPT_LIST-OPTIONS-EQ = 'X'.

   APPEND LW_OPT_LIST TO LW_RESTRICT-OPT_LIST_TAB.

   LW_***-KIND    = LC_S.

   LW_***-NAME    = LC_MAT.

   LW_***-SG_MAIN = LC_INC.

   LW_***-OP_MAIN = LC_OPT_LIST.

   APPEND LW_*** TO LW_RESTRICT-***_TAB.

   CALL FUNCTION 'SELECT_OPTIONS_RESTRICT'

     EXPORTING

       RESTRICTION            = LW_RESTRICT

     EXCEPTIONS

       TOO_LATE               = 1

       REPEATED               = 2

       SELOPT_WITHOUT_OPTIONS = 3

       SELOPT_WITHOUT_SIGNS   = 4

       INVALID_SIGN           = 5

       EMPTY_OPTION_LIST      = 6

       INVALID_KIND           = 7

       REPEATED_KIND_A        = 8

       OTHERS                 = 9.

now when i click the extension button i will be getting the popup window with ' SELECT SINGLE VALUES' sub screen  now in this i need only 5 rows

I don't know weather this is possible or not.

If yes . can any one explain this ?

Thanks in advance .

Regards

Rakesh S.